$\lim_{x\to12}\left(\frac{x^2-144}{\sqrt{x+3}-5}\right)$
$x^2-6x-5$
$8c+2d+18c$
$\frac{3^{x-2}}{8}2^{x-2}=0$
$x^2-5x+625$
$\frac{\left(\sqrt{7}\right)^2+\left(\sqrt{7}\right)^2+\left(a-c\right)^2}{42}$
$\left(2x^2-3x\right)\left(x^3-6x^2-4x+1\right)$
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